HERE is, then,
something which is always moved with an unceasing motion, which is
motion in a circle; and this is plain not in theory only but in
fact. Therefore the first heaven must be eternal. There is therefore
also something which moves it. And since that which moves and is
moved is intermediate, there is something which moves without being
moved, being eternal, substance, and actuality. And the object of
desire and the object of thought move in this way; they move without
being moved. The primary objects of desire and of thought are the
same. For the apparent good is the object of appetite, and the real
good is the primary object of rational wish. But desire is
consequent on opinion rather than opinion on desire; for the
thinking is the starting-point.